add doc

plugin-gradle/build.gradle

 buildscript {
-    dependencies{
+    dependencies {
         classpath group: 'gradle.plugin.org.jetbrains.intellij.plugins', name: 'gradle-intellij-plugin', version: '0.4.10'
     }
 }
 
 plugins {
+    id 'idea'
     id 'java'
     id 'org.jetbrains.intellij' version '0.4.10'
 }
@@ -13,11 +14,14 @@ group 'com.duanledexianxianxian'
 version '1.0-SNAPSHOT'
 dependencies {
     testCompile group: 'junit', name: 'junit', version: '4.12'
+//    compileOnly fileTree(include: ['*.jar'], dir: ideaSDKlocalPath + '/Contents/plugins/DatabaseTools/lib')
 }
 
 // See https://github.com/JetBrains/gradle-intellij-plugin/
 intellij {
     version '2019.1.2'
+    type 'IU'
+    plugins = ['DatabaseTools'] //Bundled plugin dependencies
 }
 patchPluginXml {
     changeNotes """

plugin-gradle/src/main/resources/META-INF/plugin.xml

@@ -14,7 +14,8 @@
     -->
     <depends>com.intellij.modules.platform</depends>
     <depends optional="true">com.intellij.modules.ultimate</depends>
-    <depends>com.intellij.database</depends>
+    <depends optional="true">com.intellij.modules.platform</depends>
+    <depends optional="true">com.intellij.database</depends>
 
     <extensions defaultExtensionNs="com.intellij">
         <!-- Add your extensions here -->